JPH0875864A - Geophone movement device - Google Patents

Abstract

(57) [Summary] [Objective] To provide a geophone movement device for seismic exploration in which a plurality of geophones can be moved and installed on the survey measurement line at the same time while keeping the arrangement direction and interval constant. [Structure] The two arms of the I-shaped body frame 20 in the first direction and the first of the other I-shaped body frame 20
The two arms in the second direction opposite to the direction of are connected to each other by a pair of mat fixing frames 25 to form one unit, and a predetermined number of units are mutually connected by rotating joints at the arms of both ends of each unit. It includes a structure in which both ends of a mat 23 for mounting the geophone 4 are fixed to a pair of mat fixing frames 25 of each unit, which are connected so as to be hingedly connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground exploration using the shallow reflection method, which is one of the geological surveys to be carried out in advance when carrying out civil engineering works such as non-excavation propulsion method or shield method. It is suitable for exploration on the asphalt road surface in a city with a lot of traffic, and in particular, it is a geophone for shallow seismic reflection seismic exploration equipment for simultaneously moving and installing multiple geophones that detect elastic waves reflected in the ground. Mobile device of the present invention.

[0002]

2. Description of the Related Art Generally, when conducting shallow-layer seismic reflection surveys on the ground, multiple geophones are installed at equal intervals on the survey line and data is recorded with a relay cable connected to the main line cable. Connect to equipment. In the conventional method, in order to carry out the survey smoothly, an excessive number of geophones were installed on the survey line, and the geophones in the measurement range were selected by the data recording device to record the data. Move forward to the next measurement. The part of the geophone that completed the measurement is
It is moved to the front of the survey line and used for subsequent measurements.

This will be described with reference to FIG. A plurality of geophones A in which elastic waves are oscillated from one oscillator (source) 1 toward the ground, and reflected waves from the ground are placed on the ground of the survey line.
Detect in groups and record data at the same time. The signal from the geophone is input to the data recording device 3 via the wiring 2. FIG.
The middle geophones A group shows the selected geophones within the measurement range, and the geophones B group shows the non-selected geophones. When one measurement is completed, the position selected by the oscillator 1 is changed and the measurement is repeated. Two geophones B ′ in the group B adjacent to the geophone A group are standby geophones selected in the next measurement performed by moving the oscillator 1. With the movement of the oscillator 1, the two geophones A ′ in the group A, which are close to the oscillator 1, are moved to the tail end of the non-selected geophone B group. These operations are sequentially repeated to proceed with the measurement.

In such a conventional exploration method, the geophone A
The total number of the group and the group B is almost twice the number required for the measurement, which increases the cost and requires a lot of labor and time for the preparation, movement, and removal of the measurement. For example, the measurement is performed on the road. In this case, the required work time becomes long, which hinders road traffic.

In order to improve such manual work, the device shown in FIG. 2 has been proposed. This device suspends and moves the geophone 4 on a support 11 having a handle 13 with wheels 12. However, due to the nature of the exploration, the required conditions for the device are that the geophone and the oscillating device maintain a certain directionality, that the geophone is oscillating, and that the geophone holds a certain distance. However, the device of FIG. 2 does not satisfy these conditions. In addition, the main body has a considerable weight, requires a large amount of labor and time for measurement preparation and removal, and has not been put into practical use.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to eliminate the above-mentioned problems, and a plurality of geophones can be simply and quickly moved and installed on the survey measurement line at the same time. It is an object of the present invention to provide a seismic vibration isolator moving device that can keep the arrangement direction and spacing of the isolator constant and that can swing the geophone.

[0007]

SUMMARY OF THE INVENTION The device of the present invention is for achieving the above-mentioned object and comprises two I-shaped body frames in the first direction and another I-shaped body frame. The two body parts of the body frame of the second direction, which are opposite to the first direction, are connected by a pair of mat fixing frames to form a unit, and a predetermined number of the units are connected to each other at the ends of each unit. It is characterized in that the parts are connected so as to be hingedly connected by a rotary joint, and the pair of mat fixing frames of each unit includes a structure in which both ends of the mat for mounting the geophone are fixed. It is a geophone moving device.

[0008]

By moving the moving device according to the present invention, which mounts the geophone together with the oscillating device, according to the amount of movement of the oscillating device (the epicenter), the geophone group immediately moves to the measurement position and immediately You can start the measurement. Further, compared with the prior art, the device of the present invention has a structure in which the main body frames are hingedly connected to each other by a rotary joint and the geophone is mounted on the mat. Can move without changing the interval and follow the unevenness of the road surface, or because the geophone is fixed to the frame via the mat, the vibrations transmitted through the frame can be blocked and each geophone can receive other vibrations. There are advantages such as being able to receive weak reflected waves at each position independently of the container.

[0009]

Embodiments Next, embodiments will be described with reference to the drawings. 3 and 4 are views showing an embodiment of the apparatus of the present invention, FIG. 3 is a partial view when a geophone is mounted, (a) is a plan view,
(B) is a side view, FIG. 4 is an exploded enlarged view of a part thereof, (a)
1) is a plan view of a main body frame portion, FIG. 2A is a side view thereof, FIG. 1B1 is a plan view of a mat fixing frame and a mat portion, FIG. 2B2 is a side view thereof, and FIG.

In this embodiment, two main body frames 20 are joined to each other by connecting joints 22 on both sides of a mat fixing frame 25 to form a unit, and the main body frames 20 of adjacent units are hinged to each other by a rotary joint 21. Are bound together. In this way, by repeating the unit of the main body frame 20 and the mat fixed frame 25 by a predetermined number of times, a plurality of geophones can be moved simultaneously to form a geophone moving device. The mat 23 is fixed to the mat fixing frame 25 with screws 24, and the geophone 4 is fixed to the mat 23 with a band or the like (not shown). Therefore, the geophone 4 is swingably supported. Become. The geophone 4 is connected to the data recording device by the wiring 2.

Next, a method of using such a device of the present invention will be described. In this embodiment, the 24 geophones 4 are about 50c.
The lines are arranged at intervals of m. This is installed at a place for exploring the stratum, each geophone 4 is connected to the data recording device by the wiring 2, and a hypocenter generating a transverse wave (S wave) for exploration is installed at an appropriate distance. After making such preparations, activate the epicenter and measure the reflection data from underground through each geophone.

When one measurement is completed, a certain distance (1
Move about m) and perform the next measurement. If you do this,
It is possible to move a plurality of geophones while holding them at regular intervals, and it is possible to continue the next measurement without changing the wiring. By repeating this for the required number of times, it is possible to easily carry out the exploration for the shallow underground layer over a predetermined range (for example, 100 m) in a short time.

[0013]

Since the present invention is constructed as described above, it has the following effects. (1) By moving the main body according to the movement amount of the epicenter, the movement of the geophone group and the wiring cable is completed at the same time, so the measurement work can be simplified and the labor can be reduced.
Working time can be shortened. (2) For geophones and cables, it is only necessary to prepare the quantity required for measurement without the need for a spare device for movement. The impact on road traffic can be minimized. (3) Since the geophones can be moved while keeping the interval and arrangement direction of the geophones constant, it is possible to easily perform high quality measurement. (4) Since the device of the present invention can be easily divided and assembled, preparations before and after measurement and cleaning up can be performed in a short time with a small number of people, and transportation is also easy.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a conventional method of measuring a shallow seismic reflection method.

FIG. 2 is a diagram showing a conventional shallow seismic reflection seismic survey apparatus.

FIG. 3 is a diagram showing a portion of the shallow layer seismic reflection survey apparatus of the present invention.

FIG. 4 is an exploded view of a part of the device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oscillator (source) 2 Wiring 3 Data recording device 4 Geophone 11 Support stand 12 Wheels 13 Handle 20 Main body frame 21 Rotating joint 22 Connection joint 23 Mat 24 Screw 25 Mat fixing frame

Claims (1)

[Claims] 1. A pair of arms of the I-shaped body frame 20 in the first direction and two arms of the other I-shaped body frame 20 in a second direction opposite to the first direction. The parts are connected to each other by a pair of mat fixing frames 25 to form one unit, and a predetermined number of units are connected to each other so that they are hingedly connected by a rotary joint 21 at the arms of both ends of each unit. The mat 23 for mounting the geophone 4 is mounted on the mat fixed frame 25 of the pair of units.
A device for moving a geophone that includes a structure in which both ends of the are fixed.